People have wondered where the seat of original sin is; I think it 's in the stomach. A man eats too much and neglects exercise, and the Devil has him all his own way, and the little imps, with their long black fingers, play on his nerves like a piano. Never overwork either body or mind, boys. All the work that a man can do that can be rested by one night's sleep is good for him, but fatigue that goes into the next day is always bad.